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Stable high-internal-phase Pickering emulsion of modified bacterial cellulose nanofibers and preparation method thereof

A technology of bacterial cellulose and nanofibers, applied in the field of high internal phase Pickering emulsion, to achieve good viscoelasticity, simple method and high stability

Active Publication Date: 2020-05-29
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there have been no literature reports on the use of cellulose to stabilize high internal phase Pickering emulsions, and the preparation of high internal phase Pickering emulsions with BCNs is extremely challenging.

Method used

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  • Stable high-internal-phase Pickering emulsion of modified bacterial cellulose nanofibers and preparation method thereof
  • Stable high-internal-phase Pickering emulsion of modified bacterial cellulose nanofibers and preparation method thereof
  • Stable high-internal-phase Pickering emulsion of modified bacterial cellulose nanofibers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of bacterial cellulose nanofibers (BCNs)

[0035] CGMCC 3917 strain (Komagataeibacter hansenii) was used to culture and ferment under static conditions at 30°C, and the medium (pH 5.0) contained glucose 2% (w / v), yeast extract 0.5% (w / v), K 2 HPO 4 0.1% (w / v), MgSO 4 1.5% (w / v) and ethanol 2% (v / v). After 14 days of static culture, the whole piece of cellulose film can be obtained in the culture medium. Rinse the cellulose membrane with tap water overnight, then soak it in 0.1M sodium hydroxide solution at 80°C for 2 hours, and then rinse it repeatedly with deionized water to completely remove the alkali to obtain bacterial cellulose.

[0036] 5.0 g of bacterial cellulose was mixed with 75 mL of HCl (2.5 M), and then magnetically stirred (200 rpm) at 70° C. for 4 h to hydrolyze it. After hydrolysis, cool to room temperature, centrifuge at 10,000×g for 10 minutes, collect the precipitate after hydrolysis, and then perform secondary hydrolysis on the ...

Embodiment 2

[0045] The difference between Example 2 and Example 1 is: in step 2.1), bacterial cellulose nanofibers are prepared with distilled water to form an aqueous solution of bacterial cellulose nanofibers with a mass concentration of about 0.1% (bacterial cellulose nanofibers: the weight ratio of water=0.1 : 100), the mass ratio of BCNs:SPI in step 2.3) is 5:25, and the material obtained by homogenization treatment in step 2.3) is rotary steamed in a water bath (45° C.) to 21.43% of the original mass.

[0046] according to figure 1 and figure 2 The newly prepared high internal phase Pickering emulsion and the appearance of the emulsion after storage for 2 months are shown respectively. The high internal phase Pickering emulsion prepared in Example 2 has strong stability, and it has not been demulsified after being placed at room temperature for 2 months. Use a laser particle size analyzer (LS13320, Beckman, US) to measure the particle size of the new high internal phase Pickering ...

Embodiment 3

[0048] The difference between Example 3 and Example 1 is: in step 2.1), the bacterial cellulose nanofibers are prepared with distilled water to form an aqueous solution of bacterial cellulose nanofibers with a mass concentration of about 0.14% (bacterial cellulose nanofibers: the weight ratio of water=0.14 : 100); step 2.3) in BCNs:SPI mass ratio is 7:25, step 2.3) homogeneous treatment of the material obtained by water-bath rotary steaming (45 ℃) to 22.86% of the original mass.

[0049] according to figure 1 and figure 2 The newly prepared high internal phase Pickering emulsion and the appearance of the emulsion after storage for 2 months are respectively shown. The high internal phase Pickering emulsion prepared in Example 3 has strong stability, and it has not been demulsified after being placed at room temperature for 2 months. Use a laser particle size analyzer (LS13320, Beckman, US) to measure the particle size of the new high internal phase Pickering emulsion, the res...

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Abstract

The invention discloses a stable high-internal-phase Pickering emulsion of modified bacterial cellulose nanofibers and a preparation method of the stable high internal phase Pickering emulsion. The method comprises the following steps: 1) preparing a bacterial cellulose nanofiber solution; 2) dissolving soybean isolate protein into an ethanol solution; 3) adding the solution obtained in the step 1) into the solution obtained in the step 2), adjusting the mass ratio of the bacterial cellulose nanofibers to the soybean isolate protein to be 3:25-9:25, shearing, homogenizing and carrying out rotary evaporation; and 4) mixing the obtained concentrated solution with grease, shearing and emulsifying. According to the preparation method, a large amount of grease is embedded into the bacterial cellulose nanofibers modified by the soybean isolate protein to form the high-internal-phase Pickering emulsion, and the emulsion is high in stability and good in viscoelasticity; the method has low requirements on instruments, is simple and easy to operate, and has a good application prospect in the aspects of nutrient substance conveying carriers and food structure modification base materials.

Description

technical field [0001] The invention relates to a Pickering emulsion, in particular to a high-internal-phase Pickering emulsion stabilized by modified bacterial cellulose nanofibers. Background technique [0002] In recent years, emulsions stabilized by solid particles have attracted extensive attention in the fields of food, medicine, materials, and environmental science. Compared with traditional emulsions, the particle layer formed at the interface between internal (oil) and external (water) phases of Pickering emulsions can resist Ostwald ripening and coalescence, and has higher stability. High internal phase emulsions (HIPEs) are ultra-concentrated emulsions with an internal phase volume fraction greater than 74%. Since the phase inversion occurs when the volume fraction of the oil phase increases to a threshold during the preparation of HIPEs, traditional HIPEs are stabilized by surfactants (small molecule emulsifiers), but the amount of surfactants is large (5%- 50%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08J3/09C08L89/00C08L1/04
CPCC08J3/03C08J3/095C08J2389/00C08J2401/04Y02A40/90
Inventor 林德慧杨兴斌刘哲翟希川沈瑞
Owner SHAANXI NORMAL UNIV
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